/*EnvironBlockApplet for MS Win32 uses J/Direct to display the entire win32
   environment variable block.

					M. Gallant   01/12/2002 */

import java.awt.*;
import com.ms.security.*;
import com.ms.win32.*;

public class EnvironBlockApplet extends java.applet.Applet {
 TextArea ta = new TextArea(25, 100) ;

  public void init() { 
   add(ta) ;
    try {
      if (Class.forName("com.ms.security.PolicyEngine") != null)  // get permissions
        PolicyEngine.assertPermission(PermissionID.SYSTEM);
         ta.setText("-------------  Environment Variables  ------------\n\n" + getEnvBlock()) ;
      } 
     catch (Throwable cnfe) {  }
   } 


      /**
       * Gets the entire environment variable block
       * @return The value of the named environment variable, or
       * null if no such variable exists
       */
        private final String getEnvBlock()
         {
             // Allocate string buffer for return value
             StringBuffer value = new StringBuffer(2000);
     
             // Try to retrieve environment variable block via J/Direct
             int chars = GetAllEnvars(value, value.capacity()+1);       // terminating null character added to buff capacity by J/Direct
 
 
             // If it was not large enough, reallocate buffer and retry
             if (chars > (value.capacity()+1))     //if buffer too small, GetAllEnvars returns required buffer size including C null.
             {
	 System.out.println("\n" + value.capacity() + " character StringBuffer not large enough! expanding to " + (chars-1) + " characters\n\n") ;
                 value.ensureCapacity(chars-1);
                 chars = GetAllEnvars(value, chars);
             }
             // System.out.println("Characters read (including added <ret> after lines) " + chars) ;
             return value.toString();
         }
 
    /** @dll.import("MIGUTILSLIB", ansi) */
    static native int GetAllEnvars(StringBuffer buf,  int size);

 public void paint(Graphics g) {  // black border around applet panel
   g.setColor(Color.black) ;
   g.drawRect(0,0,this.getSize().width-1, this.getSize().height-1) ; 
  }

}